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a in (-oo:+oo)
a = (3*12^2)/(7^3) // - (3*12^2)/(7^3)
a-((3*12^2)/(7^3)) = 0
a-3*7^-3*12^2 = 0
a-432/343 = 0 // + 432/343
a = 432/343
a = 432/343
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